Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in C:\xampp\htdocs\hannoole\PMS\vendor\quickbooks\v3-php-sdk\src\Utility.Test\JsonObjectSerializerTest.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hannoole\PMS\vendor\quickbooks\v3-php-sdk\src\Utility.Test\JsonObjectSerializerTest.php on line 16